Yeastar SO Module — 1 FXS + 1 FXO Expansion Module
The Yeastar SO Module adds one FXS port and one FXO port to compatible Yeastar VoIP PBX systems, providing analog extension and PSTN line support with PSTN failover capability for uninterrupted telephony. Supports key Yeastar S‑Series and P‑Series platforms.
Yeastar SO Module — Combined FXS & FXO Port (PSTN Fallback) for PBX
The Yeastar SO Module is a versatile expansion unit designed to enhance the telephony capabilities of compatible Yeastar VoIP gateways and PBX systems. Combining 1 FXS port and 1 FXO port, this module enables both analog extension support and PSTN line connectivity, offering flexible deployment options for hybrid telephony environments.
With the integrated FXS port, the SO Module allows analog devices such as desk phones, fax machines, and POS terminals to connect to VoIP systems. Meanwhile, the FXO port provides connectivity to traditional PSTN telephone lines, enabling seamless call routing between legacy networks and modern IP-based communication platforms.
Ideal for small to medium business setups, branch offices, or locations with mixed analog and PSTN requirements, the Yeastar SO Module delivers reliable voice quality, efficient call management, and expanded telephony support — all without requiring separate gateway units.
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